Subscribe to the gold package and get unlimited access to Shamra Academy
Register a new userStudying of effect of different profile types of pipes on pressure values resulted from water hammer
دراسة تأثير أشكال المقاطع الطولية المختلفة للأنبوب على قيم الضغط الناتجة عن الصدمة المائية
1541
2 27
0
(
0
)
Authors
معلا معلا( باحث )
Created by
Shamra Editor
Ask ChatGPT about the research
تم اجراء دراسة وصفية تحليلية لتفسير كيفية تأثير المقطع الطولي للأنبوب على قيم الضغط للصدمة المائية الناتجة عن توقف المضخات , والتي ينتج عنها موجة ضغط منخفض غالبا ما تؤدي الى حصول التكهف في الشبكة,وقد تبين من الدراسة التحليلية لعدة مقاطع ومقارنة النتائج أن تأثير المقطع الطولي مرتبط بظاهرة التكهف,وإن شكل المفطع الطولي ومنسوب خط الضغط الحاصل بعد توقف المضخات يحدد نوعية التكهف المتشكل والمنطقة التي يحدث بها وقيم الضغط الناتجة عنه والتي تختلف من مقطع لآخر,كما أنه عند عدم احتواء المقطع على ذروة , أو احتوى على ذروة أو أكثر منسوبها تحت منسوب خط الضغط , يحدث التكهف المنتشر وتزداد قوى الضغط الناتجة عنه كلما زاد طول الأنبوب المعرض للتكهف,أما في حالة وجود ذروة أو أكثر فتأثير الذروة مرتبط بعدة عوامل: 1- كلما زاد ارتفاع الذروة عن خط الضغط,تزداد إمكانية حصول انفصال في بنية السائل,وتزداد قوى الضغط الناتجة عن الصدمة, ولا تظاثير للذروة في حال وقوعها تحت خط الضغط. 2- تزداد قوى الضغط الناتجة عن الصدمة كلما كانت الذروة أقرب للمضخات.
Analysis study was done to explain the effect of the longitudinal section on the values of pressure of the water hammer resulting from the trip of pumps, which results a low pressure wave often lead to get cavitation, has been shown from the analytical study of several profiles and compare the results, that the shape of the profile and the level of the pressure line after the stopping of pumps determines the type of cavitation formed , the region in which it occurs and the pressure values resulting from it, when the profile doesn’t contain bends or the bends are below the level of line pressure a distributed cavitation is occurred, In the case of the presence of high points , the effect of the bend is linked to several factors: 1 - the greater the height of the bend above line pressure increases the possibility for column separation and increases the pressure forces. 2 –the pressure forces increase whenever the bend closer to the pumps.
References used
Bergant, A, and Simpson, A.R. (1997). Development of a generalized set of pipeline water hammer and column separation equations., University of Adelaide, Adelaide, Australia,350P
GARR M. JONES , 2006 - pumping station design , Butterworth-heineman ,USA ,640P
rate research
Read More
Because of the importance of water hummer and it’s big impact in
pumping pipes, an analytical study of water hummer resulting from
the pumping station abruptly stopped working (due to a power
outage on water pipe line that conveys water from groun
d open tank
to three overhead open tanks was conducted, and without means of
protection from water hummer .
maximum and minimum pressure values and the location of each of
them in the network have been identified.
It was found that the pump trip caused a transient state with
negative pressure along the pipe system. The values of maximum
pressure were less than the pressure tube run.
An analytical study was done to explain the
relationship between the performance of gas accumulator, surge
tank and vacuum breaker valve and the profile of the pipe.
The study proved that effectiveness of protection means vary
according to the longitudinal path of pipe.
This search include making laboratory tests on sandy soil samples
,wich were taken from Damascus Suburb (Alkastal-Maarona-
Alsallema) and from Hama(Alsalameya), physical and clasificated
tests were made besides oedometer tests, two limited cases w
ere
studied :maximum loose and maximum dense for each soil.
Values of deformation modulus (E) were determined from
oedometric compression curves at various compression levels, and
then the experimental equations between deformation modulus
and primary void ratio, and between modulus of lateral soil
pressure and deformation modulus were concluded at maximum
loose and maximum dense.
The aim of this paper is to present a recent experimental investigation of the wall pressure distribution observed during the emptying of a modeling silo, with and without, inserts, for three different
heights hi of the insert base above the hopper
outlet. The experiments were carried out with corn, at the concrete lab. in faculty of civil engineering in Damascus university in Syria. The results show that the upper-cone with downer-cone trunk insert had a strong influence on the pressures in the silo.
This work is assigned to study the influence of different interaction potential forms
on the pressure and internal energy of crystalline argon along its isothermal curves at high
temperatures, expanded from melting point temperature up to room temp
erature at
different molar volume values expanded up to its value, corresponded experimental
equilibrium curves with gaseous and liquid phases within the framework of quasi-classical
approximation. The pair-wise inter-atomic forces in conjunction with three-body forces
were taken into consideration. The results of this study regarding the pressure and internal
energy of crystalline Argon were compared with available experimental data. The
comparison clearly indicates that the calculated results coincide well with the experimental
results.
Log in to be able to interact and post comments
comments
Fetching comments
Sign in to be able to follow your search criteria
